Abraham w



Oct. 16 1923. 1,471,210

A. w. ROSEN ELECTRICAL. SWITCH Filed Jan. 27. 1922 INVENTOR 411m hum W/Tosew W ATTORNEY Patented Oct. 16, 1923.

UNITED I STATES ABRAHAM W. ROSEN, OF NEW YORK, N. Y.

ELECTRICAL SWITCH.

Application filed January 27, 1922. Serial No. 532,147.

To all whom it may concern.

Be it known that I, ABRAHAM W. RosnN, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Electrical Switches, of which the following a specification.

My invention relates to improvements in electrical switches, particularly of the type employed for controlling the illuminated stop signals carried at the rear of automobiles.

The principal object of the invention is to provide a compact, simply constructed, well insulated switch, which may be pro duced at low cost and which is thoroughly reliable in operation.

The invention consists of the structural features and combinations hereinafter described and claimed, and illustrated in the accompanying drawing, in which Fig. 1 is a plan view of the improved switch; Fig, 2 is a side elevational view; Fig. 3 is a view similar to Fig. 1 with the switch cover re moved; Fig. 4 is a longitudinal sectional view on the line 47-; of Fig. 1; and Fig. 5 is a transverse sectional view on the line 55 of Fig. 1.

Referring to the drawing by reference characters, 10 denotes the base of the switch,

preferably of metal, which has connected thereto or formed integrally therewith the oppositely disposed lugs or standards 11 and 12. Perforated lateral extensions 13 of the base 10 provide means by which the switch may be secured in desired position. Held to the base 10 by any suitable means, such as rivets 14, are double layersof insulating material 15 and 16. The insulating material stops short of the extensions 13 so that the latter are uncovered.

Supported on the uppermost layer 16 of insulation is a pair of overlapping spring contacts 17 and 18, their free overlapping ends being suitably bent away from the switch base to permit such ends to have limited movement. The contacts are formed of flat spring metal and each contact, intermediate its ends, is eyeletted or otherwise secured at 19 to the insulating strip 16. Adjacentits extreme outer end, each spring contact is provided with an internally threaded sleeve 20 to receive the binding screws 21 for securing the terminals of the conducting wires (not shown) to the switch. It is to be particularly noted that the eyelets 19 and screws 21 pass through the insulating strip 16 only and not through the .strip 15, so that the latter acts as an absolute insulator and eliminates all dangcr of a possible short circuit between the upper metallic conducting parts and the lower metallic base 10.

Rotatably mounted in suitable openings in the standards 11 and 12 is a shaft 22, of full diameter for the greater portion of its length, but reduced at 22" where it passes through the standard 12 and having its re duced end squared as at 22 to receive and retain the switch arm 23 beyond the standard 12.

Carried by the shaft 22, intermediate its ends, is a cam disc 2-l for. operating the spring contacts 171S. The disc 24 is provided with a flattened peripheral portion 25, which may be considered as the non-open ative portion of the disc with respect to its action on the contacts 17-18. The disc is held in position on the shaft by being laterally confined between the inner faces of washers 26 and 27 interconnected by and preferably integral with a sleeve 28 firmly secured to the shaft 22. Coiled about the shaft 22 between the disc 24 and the standard 11 is a spring 29 one end of which is anchored to a lug 3O struck up from the metal of standard 11, and the other end of which is passed through openings in the disc 24 and washers 26 and 27 and is there secured by solder or in any other appropriate manner. Projecting from the outer face of the standard 12 is a headed stud or screw 31 serving as a stop for the arm 23 which, in effect, is rigid with the shaft 22.

As before stated, the switch is particularly adapted to control the operation of stop lights carried at the rear of automobiles, and when so used the switch arm 23 is connected by a cord or wire (not shown) to the brake lover of the vehicle. The arm 23 is provided with a plurality of spaced holes 32 through any of which one end of the cord may be passed, the position of the particular hole used for this purpose deter mining the throw of the arm under the action of the brake lover,

The contact springs 17--18, disc 24: and spring 29 are preferably enclosed by a dust excluding cover, which may consist of an arched insulating cap 38 and a similarly shaped metal hook 34. The cover as a whole switch and the members 33 is easily applied to and removed from the and are 111OV- able independently one of the other. The cap 33 has projecting ends 33 which, when the cover is applied to the switch, overlie the eyelets 19 and form a support for the lower edge of the member In this manner adequate insulation is provided between the hood Sat and other metallic conducting parts so to prevent danger of short circuiting. 4

lVhen the several parts of the switch are properly assembled, as shown in the drawing, the tension of spring 29 is such as to hold the arin 23 against the. stop 3;1 (full line position oi? Fig. 4:) and the flat portion 25 of disc 2% is parallel to springs 17-18 so that the latter are out of contact and the circuit is broken. It will be readily understood that the requisite tension may be im parted to spring 29 by removing stop bl turning arm 23 as otten' as necessary and then reinserting stop against which arm 23 snaps. If the brake pedal of the vehicle on which the switchis installedi depressed in the act of stopping or slowing speed, pull will be exerted on the arm 23 causing rotation of shaft 22 and of disc 24:. A Very slight rotary movement oi disc a l will cause one end of the flat surface press against the uppermost spring 18 there by moving the springs 17Il8 into contact: and causing illumination of the stop signal (not shown) which is electrically connected to the switch through one of the binding pcstsQl the other being connected to the usual battery or other source of electric eur- "ent carried by an automobile. Vhen the brake pedal is fully depressed the arm 23 will assume the dotted line position shown in Fig. l, with a par; of the round periphery ot' the disc pressing the springs l7l8 into contact and maintaining the stop signal illuminated. As soon as pressure is reniored'troin the brake pedal the spring 29 will nap arinQS-S back to its p sition of rest with the hat part ojt disc fi l over springs i'7-l8 so that the latter will be out of contact and the signal will not be illuminated.

I claim .lrn electric switch, comprising a supportin base and oppositely disposed standards, r itt rotatably mounted. in said standards, a sleeve on said shaft and parallel washers at the opposite ends of: the sleeve, a disc carried by said sleeve and confined to its position. by said washers, contact members on the sii; i1) )1ft:ii1g base in position to be on by the disc, and aspring'coiled acted about said shaft one end of said spring being anchored to one of thestandards and the oil er end of the spring passing through said disc and washers.

in testimony whcreot I have afiiited my sign atu re.

ABBA HAM \V. ROSEN. 

